Saint Symeon became a monk of the Studite Monastery as a young man, under the guidance of the elder Symeon the Pious.  Afterwards he struggled at the Monastery of Saint Mamas in Constantinople, of which he became abbot.  After enduring many trials and afflictions in his life of piety, he reposed in 1022.  Marvelling at the heights of prayer and holiness to which he attained, and the loftiness of the teachings of his life and writings, the church calls him "the New Theologian."  

Only to two others, John the Evangelist and Gregory, Patriarch of Constantinople, has the church given the name "Theologian."  Saint Symeon reposed on March 12, but since this always falls in the Great Fast, his feast is kept today.